Matthew 6:1

Matthew 6: 1 But take care not to do your righteousness before men in order to be gazed at by them; otherwise, you have no reward with your Father who is in the heavens. 

Footnote on "Father"

To the kingdom people God is not only their God but also their Father; they are not only created by God but also regenerated by the Father. They have not only the created, natural human life but also the uncreated, spiritual divine life. Hence, the new law of the kingdom, decreed by the King on the mountain, is given to them with the intention that they should keep it not by their fallen human life but by the Father's eternal, divine life, not to gain man's glory but to receive the Father's reward.